X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/7f26d744d3e443d08cb485b543f30513f7da3469..56b8ebe99bfcd666e373069b2072291ab5e04ee8:/src/smpi/colls/alltoallv-pair-light-barrier.c

diff --git a/src/smpi/colls/alltoallv-pair-light-barrier.c b/src/smpi/colls/alltoallv-pair-light-barrier.c
index 60e2647375..7843d9130c 100644
--- a/src/smpi/colls/alltoallv-pair-light-barrier.c
+++ b/src/smpi/colls/alltoallv-pair-light-barrier.c
@@ -39,6 +39,10 @@ smpi_coll_tuned_alltoallv_pair_light_barrier(void *send_buff, int *send_counts,
 
   rank = smpi_comm_rank(comm);
   num_procs = smpi_comm_size(comm);
+
+  if((num_procs&(num_procs-1)))
+    THROWF(arg_error,0, "alltoallv pair algorithm can't be used with non power of two number of processes ! ");
+
   send_chunk = smpi_datatype_get_extent(send_type);
   recv_chunk = smpi_datatype_get_extent(recv_type);